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LeetCode Database Rising Temperature 197

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2016/09/11 Share

197. Rising Temperature
  Given a Weather table, write a SQL query to find all dates’ Ids with higher temperature compared to its previous (yesterday’s) dates.

+---------+------------+------------------+
| Id(INT) | Date(DATE) | Temperature(INT) |
+---------+------------+------------------+
| 1 | 2015-01-01 | 10 |
| 2 | 2015-01-02 | 25 |
| 3 | 2015-01-03 | 20 |
| 4 | 2015-01-04 | 30 |
+---------+------------+------------------+

For example, return the following Ids for the above Weather table:

+----+
| Id |
+----+
| 2 |
| 4 |
+----+

大体意思

写 SQL 查询出温度比昨天大的日期 Id

别人的解法

The DATEDIFF() function returns the time between two dates

SELECT w1.Id FROM Weather w1, Weather w2
WHERE w1.Temperature > w2.Temperature AND (DATEDIFF(w1.Date, w2.Date) = 1 )

Reference:
LeetCode Q197 Rising Temperature | Lei Jiang Coding

CATALOG
  1. 1. 大体意思
  2. 2. 别人的解法